HIGHLIGHTED-Fiber-Optics-Communications.docx

Photoconductivity 123 light traveling in optical

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d. Photoconductivity 123. Light traveling in optical fiber follows which of the following principles. a. Huygen’s principle b. Reflection theory c. Light theory d. Snell’s law 124. Optical fibers for telecommunications are typically about _____ mils thick and consists of a glass core, a glass cladding of lower index of refraction, and a protective coating a. 5 b. 6 c. 7 d. 8 125. Material dispersion is caused by the a. Wavelength dependence of the index of refraction b. Wavelength independence of the index of refraction c. Dependence of the propagation constant on the mode number d. Independence of the propagation constant on the mode number 126. Modal dispersion is caused by the a. Dependence of wavelength on index of refraction b. Dependence of propagation constant on index of refraction c. Dependence of the propagation constant on the wavelength d. Dependence of the propagation constant on the mode number 127. The dominant loss mechanisms in silica fiber are a. Absorption and radiation losses b. Absorption and Rayleigh scattering c. Coupling and radiation losses d. Radiation and modal dispersion 128. The bandwidth of a fiber is limited by a. Mode b. Wavelength c. Dispersion d. Frequency 129. Fiber bandwidth is generally specified as the a. Product of the bandwidth and distance b. Sum of the bandwidth and distance c. Difference of the bandwidth and distance d. Quotient of bandwidth and distance 130. The _____ of a detector is the fraction of incident photons that produce a photoelectron or electron-hole pair a. Responsitivity b. Photon efficiency c. Aperture d. Quantum efficiency
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131. In solid-state optical detectors, the excited charge is transported in the solid by a. Holes and protons b. Holes and electrons c. Anion and cation d. Protons and photons 132. One of the following is not a solid-state optical detector a. APD b. PIN c. PMT d. Phototransistors 133. Optical detectors are square-law devices because they respond to _____ rather than amplitude a. Intensity b. Light c. Density d. Photon 134. The _____ is equal to the number of electrons emitted per second times the electron charge a. Intensity b. Optical power c. Photocurrent d. Responsitivity 135. Which optical detector is used when high sensitivity and bandwidth are required? a. PMT b. APD c. PIN d. Phototransistor 136. What is the average loss in fiber splice? a. 0.10 dB b. 0.15 dB c. 0.20 dB d. 0.25 dB 137. Which of the following colors is not found in the visible light wave spectrum? a. Red b. White c. Orange d. Yellow 138. What is the frequency limit of an optical fiber? a. 20 GHz b. 30 GHz c. 40 GHz d. 50 GHz 139. The mechanical splice attenuation loss is _____ dB or less a. 0.1 b. 0.01 c. 0.001 d. 1 140. _____ is applied to protect core and cladding of the fiber a. Insulation b. Fiber insulation c. Silica d. Polymer jacket 141. The energy of the photon is a. Directly proportional to its bandwidth
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